CZ2014196A3 - Refrigerant compressor - Google Patents

Abstract

A refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element configured to compress the refrigerant and comprising a slidable member that is a sliding portion and a cooling oil adapted to be fed to a sliding member for lubrication of the slidable portion, wherein the polymerization inhibitor adapted to suppress refrigerant polymerization is included in the cooling oil.

Description

This application claims priority from Japanese Patent Application No. 2013-086 265, filed April 17, 2013, the entire contents of which are incorporated herein by reference.

Field of the Invention

Aspects of the present invention relate to a refrigeration compressor for use in a refrigeration plant or an air conditioner, and in particular a refrigeration compressor using ethylene fluorocarbon or a mixture using ethylene fluorocarbon as a refrigerant.

Background Art [0003]

In the field of vehicle air conditioners, HFO-1234yf (CF ₃ CF = CH ₂ ), which is propylene fluorocarbon, is known as the low GWP (global heating potential) refrigerant.

[0004]

In general, in the case of propylene fluorocarbon having a double bond in its composition, cleavage, decomposition or polymerization may occur as a result of the presence of this double bond.

Thus, for example, JP-A-2009-299 649 discloses a method of suppressing cleavage or polymerization of a refrigerant by creating a sliding sliding portion of a compressor where the temperature of this part is high so that cleavage or polymerization of propylene fluorocarbon can easily occur through a non-metallic component.

[0005]

Also tetrafluoroethylene is useful as a monomer for the production of a fluorine resin and a fluorine-containing elastomer having excellent heat resistance, chemical resistance and the like. However, since these materials are very easily polymerizable, in order to suppress polymerization, it is necessary to add a polymerization inhibitor to tetrafluoroethylene in its manufacture.

• · · ·

JP-A-H11-246 447 discloses such a technology.

SUMMARY OF THE INVENTION

HFO-1234yf, which is propylene fluorocarbon, has a high standard boiling point of -29 ° C and a lower operating pressure and less cooling capacity per suction volume than R410A (standard boiling point -51 ° C) or the like used in a stationary air conditioner equipment.

In a stationary air conditioner to achieve a cooling capacity that is equivalent to that using R410A refrigerant, through the use of refrigerant

HFO-1234yf, the refrigerant flow rate must be increased.

In this case, problems have arisen due to an increase in the cylinder capacity of the compressor, as well as problems due to an increase in refrigerant pressure losses and a deterioration in efficiency due to an increased volumetric flow rate.

[0007]

Thus, when a low GWP refrigerant is applied to a stationary air conditioner, a low GWP refrigerant with a low standard boiling point is appropriate.

In general, there is a tendency that the lower the carbon number of the coolant, the lower its low boiling point.

Thus, when compared to using propylene fluorocarbon having a carbon number of 3, as in the prior art, and using ethylene fluorocarbon having a carbon number of 2, a low boiling compound, i.e. a low boiling refrigerant, can be obtained.

[0008]

However, when compared to propylene fluorocarbon, since ethylene fluorocarbon has a high reactivity, is thermally and chemically unstable and readily cleaves, dissolves or polymerized, it is difficult to suppress cleavage or polymerization using only the procedure described in JP-A- 2009-299 649.

[0009]

Also, when using ethylene fluorocarbon as a refrigerant, cleavage or polymerization readily occurs, directly from the time of production of the refrigerant, and even during storage, cleavage or polymerization occurs.

To suppress the cleavage or polymerization of the refrigerant upon storage or later, a polymerization inhibitor is added to the refrigerant, which is ethylene fluorocarbon, as described, for example, in JP-A-H11-246 447, to suppress the polymerization at the time of refrigerant production or later.

Therefore, since the polymerization inhibitor is contained in the refrigerant, it was assumed that there was no need to add the polymerization inhibitor to the cooling oil.

However, even when the polymerization inhibitor has been added to the refrigerant, since the refrigerant circulates in the refrigerant circuit and there is a repeated phase change between the liquid and the gas, the sliding part of the compressor or the winding part of the engine where the temperature is high, the refrigerant evaporates.

Since the polymerization inhibitor is contained in the vaporized refrigerant and is entrained with it, it may not be sufficiently fed to the sliding portion of the compressor or the motor winding, so that a sufficient effect to suppress the coolant polymerization is difficult to achieve.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems, in particular in a refrigeration compressor employing ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, to suppress coolant polymerization at the sliding portion of the compression element.

[0011]

According to one aspect of the present invention, a refrigeration compressor is provided adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising:

a compression member configured to compress the coolant and comprising a sliding member that adjusts the sliding portion and a cooling oil adapted to be supplied to the sliding member to lubricate the sliding member;

wherein the polymerization inhibitor adapted to suppress the coolant polymerization is contained in the cooling oil.

[0012]

According to a further aspect of the present invention, there is provided a refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising:

a compression member configured to compress the refrigerant and comprising a sliding member which constitutes a sliding member, the sliding member being a sintered member comprising a polymerization inhibitor adapted to suppress the refrigerant polymerization.

[0013]

According to yet another aspect of the present invention, there is provided a refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, wherein the refrigeration compressor comprises:

a compression element configured to compress the coolant and an electrical element arranged to drive the compression element and comprising a winding, wherein a polymerization inhibitor adapted to suppress the coolant polymerization is contained in the gap between the windings.

[0014]

Thus, coolant polymerization can be suppressed by means of a coolant oil polymerization inhibitor.

Brief Description of the Drawings [0015]

The invention will be explained in more detail below with reference to the accompanying drawings, in which:

FIG. 1 is a longitudinal sectional view of a refrigeration compressor according to Embodiment 1 of the present invention; and

Fig. 2 is a cross-sectional view of the embodiment 1 of the present invention, A-A of Fig. 1. cooling led compressor along the line DETAILED DESCRIPTION OF THE INVENTION Embodiment 1 [0016] Embodiments will now be described this invention with reference to a rotary compressor, as an example cooling

compressor.

• · · · · · · · · · · · · · · · · · · ·

8 • · • · • · «· · • · • · · • · • · · · • * · · · • · · · · · · Although a single cylinder rotary compressor will be described as an exemplary embodiment, the invention can also be practiced by using a multi-cylinder rotary compressor. [0017] Giant. 1 a Fig. 2 shows Embodiment 1. Giant. 1 shows the view in longitudinal cut on rotary

compressor 200.

Giant. 2 is a cross-sectional view taken along line A-A of FIG. 1.

[0018]

The entire structure of the rotary compressor 200 will now be briefly described.

[0019]

The example of the rotary compressor 200 shown in FIG. 1 is a vertical type compressor comprising a sealed container 20 having a high internal pressure.

The compression element 101 is disposed at the bottom of the interior of the sealed container 20.

The electrical element 102 for driving the compression element 101 is mounted above the compression element 101 at the top of the interior of the sealed container 20.

[0020]

Cooling oil 30 for lubricating the respective sliding sliding portions of the compression member 101 is housed in the lower portion of the interior of the sealed container 20.

[0021]

First, the construction of the compression member 101 will be described.

The cylinder 1 comprising the compression chamber comprises an outer periphery having a substantially circular shape when viewed from above, and also includes a cylinder chamber 1b which represents a space having a substantially circular shape when viewed from above.

The chamber 1b of the cylinder 1 is open at both its ends in the axial direction.

The roller 2 has a predetermined height in the axial direction when viewed from the side.

[0022]

The roller 11 comprises parallel blade grooves 1a formed so as to penetrate the roller 11 in the axial direction.

Each vane groove 1a communicates with a cylinder chamber 1b formed of a substantially circular space in the cylinder 11 and extends in the radial direction of the cylinder 11.

[0023]

A back pressure chamber 1c is formed on the back (outside) of the blade groove 1a, which is a space interconnected.

with a blade groove 1a and having a substantially circular shape when viewed from above.

[0024]

The cylinder 7 has an inlet or suction port (not shown) through which suction gas passes from an externally arranged cooling circuit.

The inlet suction opening penetrates through the chamber 1b of the cylinder 1 from the outer peripheral surface of the cylinder 11.

[0025]

The cylinder 7 comprises a discharge opening (not shown) formed by cutting off a portion adjacent to the circle forming the cylinder chamber 1b (the end face on the side of the electrical element 102), which is essentially a circular space.

[0026]

The roller 11 is formed from gray cast iron, sintered or carbon steel, or the like.

[0027]

The rolling piston 2 is eccentrically rotated in the cylinder chamber 1b.

The rolling piston 2 has an annular shape, the inner circumference of the rolling piston 2 sliding against the eccentric shaft portion 6a of the crankshaft 6.

• · · ·

[0028]

The rolling piston 2 and the cylinder 7 perform an eccentric movement such that the outer periphery of the rolling piston 2 almost follows the inner wall of the cylinder chamber 1b.

[0029]

The rolling piston 2 is formed, for example, of alloy steel, containing chromium or the like.

[0030]

The vane 3 is mounted in the vane groove 1a of the cylinder 1, being always pressed against the rolling piston by a vane spring 8 arranged in the chamber

1c back pressure.

In the case of a rotary compressor

200, since the sealed vessel 20 has a high internal pressure, so when the rotary compressor 200 starts its operation, the force caused by the pressure difference between the high internal pressure in the sealed vessel 20 and the pressure in the chamber 1b of the cylinder 1 side of the back pressure chamber 1c of the vane 3.

Thus, the vane spring 8 is used in particular to press the vane 3 onto the rolling piston 2 at the start of operation of the rotary compressor 200 (when there is no pressure difference between the interior of the sealed vessel 20 and the chamber 1b of the cylinder 1).

[0031]

The shape of the vane 3 is a flat and substantially rectangular parallelepiped (the thickness in the circumferential direction is smaller than the lengths in the radial and axial directions).

L0032]

The blade 3 is preferably made of high-speed tool steel.

[0033]

The main bearing 4 slidably engages the main shaft portion 6b (above the eccentric shaft portion 6a) of the crankshaft 6 and closes one end surface (on the electrical element 102) of the chamber 1b of the cylinder 7 (including the vane groove 1a) of the cylinder 1.

[0034]

The main bearing 4 comprises a discharge valve (not shown).

However, the discharge valve may also be provided in the main bearing 6, the secondary bearing 5, or both.

[0035]

The main bearing 4 has essentially the shape of an inverted T when viewed from the side.

[0036]

The sub-bearing 5 slidably engages the minor shaft portion 6c (the portion which is located downwardly from the eccentric crankshaft 6 and closes the second end surface (arranged on the cooling oil side 30) of the cylinder chamber 1b (including the vane groove 1a). 0037]

The secondary bearing 5 is substantially T-shaped when viewed from the side.

[0038]

The main bearing 4 and the secondary bearing 5, like the cylinder 2 ', are respectively made of gray cast iron, sintered or carbon steel or the like.

[0039]

The discharge silencer is mounted on the outside (on the side of the electrical element 102) of the main bearing 4.

The high temperature and high pressure extruded gas, which is expelled from the main bearing discharge valve 4, enters the discharge silencer 2 and is then blown from the discharge silencer 7 into the sealed container 20.

However, the discharge silencer 2 can also be arranged on the side of the secondary bearing 5.

• ···································· · 9 [0040]

A suction damper 21 is provided on the side of the sealed container 20, which sucks low-pressure refrigerant gas from the refrigerant circuit and prevents liquid refrigerant from being sucked directly into the cylinder chamber 11 when the liquid refrigerant returns.

The suction damper 21 is connected via the suction tube 22 to the suction opening of the cylinder 1.

The main body of the intake silencer 21 is attached to the side surface of the sealed container 20 by welding or the like.

[0041]

Next, the construction of the electrical element 102 will be described.

A brushless or brushless DC motor is used as an electrical element 102.

However, the induction motor can also be used as an electrical element 102.

[0042]

The electrical element 102 comprises a stator 12 and a rotor 13.

The stator 12 is connected and fixed to the inner peripheral surface of the sealed container 20, the rotor 13 being positioned within the stator 12 with a clearance between them.

[0043]

The stator 12 comprises a stator iron core 12a that is formed by cutting an electromagnetic steel plate having a thickness of 0.1 to 1.5 mm to a predetermined shape, superimposing a predetermined number of cut pieces in the axial direction and attaching them to each other by means of sealing, for example by welding or the like.

The stator 12 further comprises a three-phase winding 12b wound on a plurality of tooth parts (not shown) of the stator iron core 12a by a concentrated winding method.

Three-phase winding 12b Yippee wound on gear parts via of an insulating member 12c. Winding 12b is created of copper wires, coated with AI

(imide amide) / E1 (imide ester) or the like.

They are particularly used for the insulating member 12c

PET (polyethylene terephthalate),

PBT (polybutylene terephthalate),

FEP (tetrafluoroethylene hexafluoropropylene copolymer (4.6 fluorinated)),

PFA (tetrafluoroethylene perfluoroalkyl vinyl ether copolymer),

PTFE (polytetrafluoroethylene),

LCP (liquid crystal polymer),

PPS (polyphenylsulfide), phenolic resin, and the like.

[0044]

The winding 12b partially protrudes from the two ends in the axial direction (the axial direction of the upper and lower ends in FIG. 1) of the stator iron core 12a.

The protruding portions are called coil ends.

In Fig. 1, the portion indicated by 12b represents one coil end of the winding 12 (on the side opposite the compression element 101).

The guide wire 23 is connected to a terminal (not shown) that is mounted on the insulating member 12c.

[0045]

The slots (not shown) are formed on the outer periphery of the stator iron core 12a, in a number of positions, with substantially regular intervals.

These slots represent one of the passages for the extruded gas that is extruded from the discharge silencer into the sealed vessel 20, and also serves as a passage through which the cooling oil 30 returns from the top of the electrical element 102 to the bottom of the sealed vessel 20.

[0046]

The rotor 13 disposed within the stator 12, with a clearance (typically about 0.3 to 1 mm) therebetween, comprises a rotor iron core 13a, which, like the stator iron core 12a, is formed by cutting an electromagnetic steel plate having a thickness of 0.1 up to 1.5 mm, to a predetermined shape, by superimposing a plurality of cut-out parts in the axial direction, and attaching them together by means of sealing, welding or the like.

The rotor 13 further comprises a permanent magnet (not shown) which is intended to be received in a permanent magnet receiving aperture (not shown) formed in the rotor iron core 13a.

As a permanent magnet, a magnet made of, for example, ferrite or rare earth is used.

[0047]

In order to prevent the permanent magnet receiving in the permanent magnet receiving opening from falling out in the axial direction, end plates are provided at both ends in the axial direction of the rotor 13 (in FIG. 1 at the upper and lower ends in the axial direction).

• · ·

The rotor 13 comprises an upper end plate 13b, at the upper end portion in the axial direction and a lower end plate 13c at the lower end portion in the axial direction.

[0048]

The upper and lower end plates 13b and 13c serve as rotary balancing devices.

In addition, the upper and lower end plates 13b and 13c are integrally secured by utilizing a plurality of fastening rivets or the like (not shown).

[0049]

The rotor iron core 13a has a plurality of through holes (not shown) which extend substantially in the axial direction and serve as gas channels for the extruded gas.

[0050]

The terminal 24, which is intended to be connected to a power supply serving as an electrical power supply, is secured to the sealed container 20 by welding.

In the exemplary embodiment of Figure 1, the end cap 24 is disposed on the top surface of the sealed container 20.

A guide wire from the electrical element 102 is connected to the terminal 24.

• · · · · · · · · · · ·

[0051]

On the upper surface of the sealed container 20 is mounted a discharge tube 25 having two open ends.

Thus, the extruded gas extruded from the compression member 101 is extruded from the sealed vessel 20 via the discharge tube 25 to the external cooling circuit.

[0052]

When the electric element 102 is designed as an induction motor, the rotor 13 has a rotor iron core 13a formed by cutting an electromagnetic steel plate having a thickness of 0.1 to 1.5 mm into a specific shape by superimposing a plurality of cut parts in the axial direction, and attaching them to each other by sealing by welding or the like.

The rotor 13 further has a cage winding formed by filling or inserting an aluminum or copper conductor into a groove formed in the rotor iron core 13a, the two ends of the conductor being shorted by an end ring.

[0053]

For example, POE (polyol ester), which is synthetic oil, PVE (polyvinyl ether) and AB (aralkylbenzene), is used as the cooling oil 30 to be collected at the bottom of the interior of the sealed container.

• · · ·

The viscosity of the oil has been chosen to be sufficient to lubricate the rotary compressor 200, including mixing the coolant with the oil, which also prevents the rotary compressor 200 from degrading.

Generally, the kinematic viscosity at (43 ° C) of the base oil is from about 5 to 300 [cSt].

[0054]

The cooling oil contains from 0.1% to 5% limonene as a cooling polymerization inhibitor.

[0055]

In the compressor, trans-1,2, difluoroethylene (R1132 (E)) is used as the refrigerant, which is a low boiling refrigerant, similar to R410A.

[0056]

The general function and operation of the rotary compressor 200 will now be described.

When energy is supplied from the terminal 24 and the guide wire 23 to the stator 12 of the electrical element 102, the rotor 13 rotates.

As a result, the crankshaft 6 attached to the rotor 13 rotates, with the rolling piston 2 rotating eccentrically in the cylinder chamber 1b of the cylinder 1.

by the chamber 1b of the roller 7 and the rolling part by means of the vane 3.

shaft 6 with volumes of both spaces

The space between the cylindrical piston 2 is divided into two

When rotating the crankshaft changes.

Specifically, refrigerant is sucked into one space from the intake silencer 21 as a result of its gradually increasing volume, while in the other space the cooling gas is compressed as a result of its gradually decreasing volume.

The pressurized discharged gas is discharged from the discharge silencer 7 into the sealed container 20, then passes through the electrical element 102 and is further discharged from the discharge tube 25 attached to the sealed container 20 to the outside of the sealed container 20.

[0057]

The extruded gas flowing in front of the electrical element 102 passes through the rotor bore 13 of the electrical element 102, through an air gap comprising a slot opening (not shown) of the stator iron core 12a, slots formed on the outer periphery of the stator iron core 12a, and the like.

[0058]

When the rotary compressor 200 performs the above function, as described below, there is a plurality of sliding parts where the components slide relative to each other:

• · · · · · · · · · · · · · · · · · ·. . · ·;

• ·.

• · ·. ·

· .. * i ......

(1) First sliding portion: The outer periphery 2a of the rolling piston 2 and the forward end 3a (inside) of the vane 3;

(2) Second sliding portion: The blade groove 1a of the roll 1 and the side surface portions 3b of the blade 3 (both side faces);

(3) Third sliding portion: The inner circumference 2b of the rolling piston 2 and the eccentric shaft portion 6a of the crankshaft 6;

(4) Fourth sliding portion: The inner periphery of the main bearing 4 and the main shaft portion 6b of the crankshaft 6; and (5) Fifth sliding portion: Inner circumference of the auxiliary bearing 5 and the auxiliary shaft portion 6c of the crankshaft 6.

[0064]

The components that are arranged in the compression member 101 and represent sliding parts are as follows:

(1) Cylinder 1;

(2) Rolling piston 2;

(3) Shovel 3;

(4) Main bearing 6;

(5) Secondary Bearing 5;

(6) Crankshaft 6.

[0071]

Furthermore, although not shown, there is also a known rotary compressor of the swinging type in which, when the drive shaft is driven, at the same time the protruding forward end portion of the vane 3 formed integrally on the rolling piston 2 moves in and out relative to the support body along the bearing grooves of the support body, so that the support body rotates. That is, in a rotary compressor of the swinging type, the blade 3 extends and retracts in the radial direction, exerting a swinging movement as a result of the rotation of the rolling piston 2, thereby always dividing the interior of the cylinder chamber 1b into a compression chamber and a suction chamber.

• · · ·

[0072]

In such a rotary-type rotary compressor, the forward end portion of the vane 3 and the receiving groove in the support body constitute a sliding portion.

[0073]

Also, a cylindrical holding hole is formed between the suction and discharge orifices in the cylinder.

A support body formed of two semicircular shape members, each having a semicircular shape cross-section, is pivotally connected to a cylindrical holding hole.

Therefore, the outer peripheral surface of the support body and the tubular holding hole in the cylinder constitute another sliding portion.

[0074]

In this embodiment, since trans-1,2, difluoroethylene (R1132 (E)) is used as the refrigerant, the refrigerant is thermally and chemically unstable so that cleavage or polymerization can readily occur due to the chemical reaction.

If the coolant is polymerized to form a polymer, there is a possibility that the interior of the compressor or refrigerant circuit may be clogged or blocked by the polymer.

Especially in the part where the temperature is high, the chemical reaction of the coolant will be promoted so that polymerization can easily occur.

• · · ·

Therefore, in order to suppress the polymerization of the refrigerant, it is necessary to take measures, for example to attach the polymerization inhibitor to the high temperature portion.

[0075]

The above sliding parts of the compression element and the winding parts of the electrical element are parts where the temperature in the compressor is high.

The sliding portion of the compression element generates heat when the components of the compression element slide relative to each other, and the wound portion of the electrical element generates heat when current is supplied to the windings for rotation of the rotor 13.

[0076]

Since ethylene fluorocarbon has a high reactivity, even during storage at room temperature, cleavage or polymerization occurs.

Therefore, when using ethylene fluorocarbon as a refrigerant, a refrigerant polymerization inhibitor is added to the refrigerant in the manufacture of the refrigerant to inhibit polymerization.

Even during storage, the polymerization inhibitor is always admixed with ethylene fluorocarbon.

In a state where ethylene fluorocarbon and polymerization inhibitor are separated from each other, the refrigerant is not used or stored.

However, in the compressor, since refrigerant cleavage is promoted due to relative sliding movements of the metal parts, there is a high possibility that the solvent will be polymerized.

Thus, even when the polymerization inhibitor is already added to the refrigerant, the sliding parts of the compression element and the winding portions of the electrical element having a high temperature still evaporate the refrigerant, leaving the polymerization inhibitor away with the refrigerant vaporized and not left in the high temperature.

Therefore, the effect of the polymerization inhibitor cannot be sufficiently maintained.

[0077]

On the other hand, the cooling oil 30 accumulated in the sealed container 20 is fed to the respective sliding parts of the compressor by means of an oil lubrication mechanism (not shown) arranged in the compression element to lubricate the sliding parts.

Generally, the refrigerant and coolant oil are stored and transported separately, and when the air conditioner is assembled, the refrigerant and coolant oil are filled into the compressor and refrigerant circuit.

Therefore, although a polymerization inhibitor that suppresses the polymerization of a refrigerant such as limonene is added to the cooling oil, so that the cooling oil and the refrigerant do not mix with each other, the polymerization inhibitor will not act on the cooling oil during storage to suppress the refrigeration polymerization.

• · · ·

Therefore, it is not necessary to add the polymerization inhibitor to the cooling oil.

In addition, even if the cooling oil is filled into the compressor and the refrigerant circuit, when the compressor is stopped, as the refrigerant can evaporate and thereby move freely within the refrigerant circuit, the refrigerant oil collects at the bottom of the sealed vessel and cannot freely move.

Therefore, even if the polymerization inhibitor is added to the cooling oil, it will not mix with the refrigerant, so that the polymerization inhibitor will not act on the refrigerant to suppress its polymerization.

Therefore, when the compressor is stopped and when the polymerization inhibitor is already added to the refrigerant, it is not necessary to add the polymerization inhibitor to the cooling oil.

However, when the compressor is in operation, by adding a polymerization inhibitor to the cooling oil, the polymerization inhibitor can be fed to the sliding parts together with the cooling oil, while a sufficient amount of the polymerization inhibitor can be maintained on the sliding parts.

Thus, even when the sliding parts start to have a high temperature, the coolant polymerization can be suppressed.

Therefore, the polymerization inhibitor can fulfill its purpose.

Also, the high temperature refrigerant compressed by the compression element as described above passes through the electrical element 102 and is extruded to the outside.

The sealed container 20 of the discharge tube 25 disposed on the top surface of the sealed container 20.

In this case, since the refrigerant flows rapidly, a portion of the limonene-containing cooling oil is supplied to the electrical element as it is dissolved in the refrigerant.

The coolant supplied to the electrical element impinges on the electrical element, whereupon the coolant and the coolant oil are separated from each other, the coolant flowing towards the discharge tube 25 arranged at the top, and the coolant oil returns to the bottom of the sealed container where the coolant oil collect e.

Part of the separate cooling oil adheres to the winding of the electrical element when it hits the electrical element and is temporarily maintained there.

Thus, even when the winding starts to have a high temperature, the coolant polymerization is suppressed so that the polymerization inhibitor can exert its effect.

[0078]

As described above, a sufficient amount of the polymerization inhibitor can be maintained by slidingly sliding portions of the compression element and the winding portions of the electrical element that start to have a high temperature in the compressor by supplying a cooling oil containing limonene as the polymerization inhibitor.

[0079]

Also, the polymerization inhibitor contained in the refrigerant acts on the vaporized refrigerant, effectively suppressing the refrigerant polymerization.

[0080]

Thus, for high temperature parts that are readily polymerized, polymerization can be suppressed by means of a cooling oil containing limonene.

Therefore, even when using a coolant that is readily polymerized, sufficient reliability can be maintained.

[0081]

The above description exemplifies the use of trans-1,2, difluoroethylene (R1132 (E)) as a refrigerant.

However, the use of fluoroethylene (R1141), cis-1,2 difluoroethylene (R1132 (Z)), 1,1 difluoroethylene (R1132a),

1, 1, 2 trifluoroethylene (R1123) or the like can provide similar effects.

[0082]

As described above, limonene is used as a polymerization inhibitor contained in a cooling oil.

However, a terpene hydrocarbon such as pecan, camphene, cymene and terpene or a terpene alcohol such as citronellol, terpineol and borneol may also be used.

Embodiment 2

An embodiment is a method in which, in the case of a part that can readily rise in temperature, a sufficient amount of cooling oil containing a polymerization inhibitor is provided to suppress the polymerization.

However, the polymerization inhibitor may also be included on the sliding member in advance.

This method will now be described.

[0084]

The roller 11, the main bearing 5 and the secondary bearing 5 shown in embodiment 1 can also be arranged as porous sintered parts.

The polymerization inhibitor or cooling oil containing the polymerization inhibitor is impregnated in these sintered parts in advance and the compressor is then assembled.

In this method, since the temperature increases readily in the compressor cylinder or sliding portion, the polymerization inhibitor escapes out of the sintered parts so that coolant polymerization can be further suppressed.

[0085]

Therefore, even when the polymerization conditions of the refrigerant are met in a state where the amount of cooling oil is filled

in the sliding portion of the compression element is not sufficient, so the coolant polymerization can be suppressed by the polymerization inhibitor maintained on the sintered component.

Embodiment 3

The non-sliding portion in the winding portion of the electrical element, which also has a significant temperature rise, similar to Embodiment 2, may also include a polymerization inhibitor in advance.

This method will be described below.

[0087]

In the winding portion 12b of the electrical element, each winding having a circular cross-section, a gap is formed between one winding and another winding.

This gap between the windings, as in the case of the porous property of the sintered component, is capable of containing and maintaining the polymerization inhibitor or cooling oil contained in the polymerization inhibitor.

For example, the polymerization inhibitor is contained in the working oil for use in the winding process, or the winding is immersed in the polymerization inhibitor.

32 • ···:. · *. * · · ·: ···: • * : ’· Í ·· As is an inhibitor polymerization in the wound portion 12b enough delivered to winding parts, when occurs for polymerization, it can be encouraged preventive effect polymerization refrigerants. [0088] Although there are conditions for polymerization refrigerants fulfilled

in a condition where the amount of cooling oil charged into the sliding portion of the winding portion of the electrical element is not sufficient, the coolant polymerization can be suppressed by the polymerization inhibitor contained in the winding portion.

Embodiment 4

The cooling oil used in the above embodiments generally comprises a wear prevention agent.

Since this wear agent has a function to prevent wear of the sliding particles due to its dissolution, it is known that the wear agent of the wear agent reacts with the solvent of the readily soluble ethylene fluorocarbon or its solids mixture.

There is concern that solids may accumulate in fine flow channels, such as an expansion valve and capillary tubes in the cooling cycle, which can cause clogging and thus poor cooling.

• · • ·

9 ·

9 · properly elected

In this embodiment, since the cooling oil is free of the anti-wear agent, a refrigeration compressor formed by the anti-wear reaction may not be formed that does not form solid between the solvent solvent of the substance, the ethylene fluorocarbon reagent or mixture thereof without clogging the cooling oil. circuit, so the compressor is able to maintain excellent performance for a long period of time.

[0090]

The present invention has the following illustrative and non-limiting aspects:

(1) According to a first aspect, there is provided a refrigeration compressor adapted to compress ethylene fluorocarbon or a composition comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression member configured to compress the refrigerant and comprising a sliding member that slides a sliding portion, and a cooling oil adapted to be supplied to the sliding member to lubricate the sliding portion, wherein a polymerization inhibitor adapted to suppress the coolant polymerization is contained in the cooling oil.

(2) According to a second aspect, there is provided a refrigeration compressor adapted to compress ethylene fluorocarbon or a composition comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression member configured to compress the refrigerant and comprising a sliding member; Which constitutes a sliding portion, the sliding portion being a sintered portion in which a polymerization inhibitor is adapted to suppress the coolant polymerization.

(3) According to a third aspect, there is provided a refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element configured to compress the refrigerant and an electrical element configured to drive the compression and a polymerization inhibitor adapted to suppress coolant polymerization is contained in the gap between the windings.

(4) According to a fourth aspect, a refrigeration compressor according to any of the first to third aspects has been developed, wherein the ethylene fluorocarbon comprises at least one selected from the group consisting of fluoroethylene (R1141), trans-1, difluoroethylene (R1132 (E)) , cis-1, difluoroethylene (R1132 (Z)), 1, difluoroethylene (R1132a), and 1,1,2 trifluoroethylene (R1123).

(5) According to a fifth aspect, a refrigeration compressor according to any of the first to fourth aspects has been developed, wherein the polymerization inhibitor is a terpine compound.

(6) According to a sixth aspect, a refrigeration compressor according to the first aspect has been developed, wherein the terpine compound is selected from the group consisting of limonene, pinene, camphene, cymen, terpine, citronellol, terpineol and bornelol.

(7) According to a seventh aspect, a refrigeration compressor according to any of the first to sixth aspects has been developed, wherein the compression element comprises an annular-shaped rolling piston configured to eccentrically rotate in a cylindrical chamber of the cylinder, and sliding movement in the vane groove when pressed against the rolling piston, and wherein the sliding portion is formed by the forward end of the blade and the outer periphery of the rolling piston.

(8) According to an eighth aspect, a refrigeration compressor according to any of the first to sixth aspects has been developed, wherein the compression element comprises a cylinder comprising a vane groove and a vane embedded in the vane groove of the cylinder and arranged for

slidingly sliding movement in paddle groove, and wherein slidingly sliding part is formed a shovel. [0099] (9) According to ninth aspect was developed cooling compressor according to any of the first to of the sixth aspect, whereas

the compression element comprises an annular-shaped rolling piston configured to eccentrically rotate in the cylindrical chamber of the cylinder, and a crankshaft having an eccentric shaft portion that is eccentric to the main shaft portion and wherein the sliding portion forms the inner periphery of the rolling piston and .

(10) According to a tenth aspect, a refrigeration compressor according to any of the first to sixth aspects has been developed, wherein the compression element comprises a crankshaft having a main shaft portion and a minor shaft portion, a main bearing arranged to slidably engage the crankshaft main shaft portion. and a secondary bearing arranged to slidably engage the secondary shaft portion of the crankshaft, and wherein the sliding portion comprises the main bearing, the secondary bearing and the crankshaft.

Claims (10)

CLAIMS 1. A refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture containing ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression member configured to compress the refrigerant and comprising a sliding sliding member which constitutes a sliding portion and a cooling oil adapted to be supplied to the sliding member to lubricate the sliding portion, wherein a polymerization inhibitor adapted to suppress the coolant polymerization is contained in cooling oil. 2. A refrigeration compressor, adapted to compress ethylene fluorocarbon or a mixture containing ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression member configured to compress the refrigerant and comprising a sliding member which constitutes a sliding member, the sliding member being a sintered member comprising a polymerization inhibitor adapted to suppress the refrigerant polymerization. • · · · · · · · · · · 3. Fluorocarbon refrigeration compressor or adapted to compress ethylene mixtures containing ethylene fluorocarbon as refrigerant, the refrigeration compressor comprising: a compression element configured to compress the coolant and an electrical element arranged to drive the compression element and comprising a winding, wherein a polymerization inhibitor adapted to suppress the coolant polymerization is contained in the gap between the windings. A refrigeration compressor according to any one of claims 1 to 3, characterized in that the ethylene fluorocarbon comprises at least one substance selected from the group consisting of fluoroethylene (R1141), trans-1, 2 difluoroethylene difluoroethylene difluoroethylene (R1132a), and 1,1,2 trifluoroethylene A refrigeration compressor according to any one of claims 1 to 4, wherein the polymerization inhibitor is a terpine compound. 6. The refrigeration compressor of claim 5, wherein the terpine compound is selected from camphene, cymen, terpine, limonene, pinene, citronellol, terpineol and bornelol. A refrigeration compressor according to any one of claims 1 to 6, characterized in that the compression element comprises an annular-shaped rolling piston arranged for eccentric rotation in the cylinder chamber of the cylinder, and a vane mounted in the vane groove of the cylinder and arranged for sliding movement in the cylinder. a sliding groove when pressed against the rolling piston, and wherein the sliding portion is formed by the forward end of the blade and the outer periphery of the rolling piston. A refrigeration compressor according to any one of claims 1 to 6, wherein the compression element comprises a cylinder comprising a paddle groove and a paddle mounted in the paddle groove of the cylinder and configured to slidably slide in the paddle groove, and wherein the sliding portion it consists of a blade groove and a blade. • · · · A refrigeration compressor according to any one of the claims 1 to 6, characterized in that the compression element comprises an annular-shaped rolling piston configured to eccentrically rotate in a cylindrical chamber of the cylinder and a crankshaft having an eccentric shaft portion that is eccentric to the main shaft portion and wherein the sliding portion forms the inner periphery the rolling piston and the eccentric shaft portion of the crankshaft. 10. A refrigeration compressor according to any one of claims 1 to 6, characterized in that the crankshaft compression element having a main shaft portion and a secondary shaft portion, a main bearing arranged to slidably engage the main shaft portion of the crankshaft, a secondary bearing, arranged to slidably engage the minor shaft portion of the crankshaft, the sliding portion comprising the main bearing, the secondary bearing and the crankshaft.